...

// Set the desired duration of the video, in seconds.
private static final int DURATION_SECONDS = 10;

...

public void createVideo() throws IOException {
    ...

    // Encode the video frame by frame.
    ByteBuffer[] videoEncoderInputBuffers = videoEncoder.getInputBuffers();
    ByteBuffer[] videoEncoderOutputBuffers = videoEncoder.getOutputBuffers();
    MediaCodec.BufferInfo videoBufferInfo = new MediaCodec.BufferInfo();
    boolean videoEncoderDone = false;
    int videoGeneratedIndex = 0;
    while (!videoEncoderDone) {
        int videoEncoderInputBufferIndex = videoEncoder.dequeueInputBuffer(-1);
        if (videoEncoderInputBufferIndex >= 0) {
            // Send the frame to the video encoder.
            ByteBuffer videoEncoderInputBuffer = videoEncoderInputBuffers[videoEncoderInputBufferIndex];
            videoEncoderInputBuffer.clear();
            long presentationTime = videoGeneratedIndex * 1000000 / FRAME_RATE;
            videoEncoder.queueInputBuffer(videoEncoderInputBufferIndex, 0, 0, presentationTime, 0);
            videoGeneratedIndex++;
        }

        // Check if the video encoder has generated any output.
        int videoEncoderOutputBufferIndex = videoEncoder.dequeueOutputBuffer(videoBufferInfo, 0);
        if (videoEncoderOutputBufferIndex >= 0) {
            // Write the output to the file.
            ByteBuffer videoEncoderOutputBuffer = videoEncoderOutputBuffers[videoEncoderOutputBufferIndex];
            videoEncoderOutputBuffer.position(videoBufferInfo.offset);
            videoEncoderOutputBuffer.limit(videoBufferInfo.offset + videoBufferInfo.size);
            mediaMuxer.writeSampleData(videoTrackIndex, videoEncoderOutputBuffer, videoBufferInfo);

            // Release the output buffer.
            videoEncoder.releaseOutputBuffer(videoEncoderOutputBufferIndex, false);
        }

        // Check if the video encoder has finished encoding the video.
        if ((videoBufferInfo.flags & MediaCodec.BUFFER_FLAG_END_OF_STREAM) != 0) {
            videoEncoderDone = true;
        }
    }

    // Stop and release the video encoder.
    videoEncoder.stop();
    videoEncoder.release();

    // Stop and release the MediaMuxer.
    mediaMuxer.stop();
    mediaMuxer.release();
}